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  • BSI Flex 1903 v1:2023-08 formally released

    This is an interactive version 1 of BSI Flex 1903 v1.0:2023-08. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector.

    We welcome your engagement and comments on this version to help inform the development of the next version. Comments on clauses or terms in the standard should be made via the BSI Standards Development Portal. We would also welcome general feedback including what terms could be considered for future versions and these can be made through our dedicated feedback page.

atypical air environment



  • Definition

    volumes of airspace where crewed aircraft do not routinely fly and the likelihood of an otherwise unmitigated encounter with a crewed aircraft is reduced to an acceptable level


    NOTE 1 Examples include airspace near manmade structures such as buildings or high voltage powerlines, or at altitudes above those achievable by most crewed civil aircraft.

    NOTE 2 Atypical air environments might exist within segregated or non-segregated airspace, however the main purpose of their identification is to facilitate BVLOS operations in non-segregated airspace.

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